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104 lines
2.0 KiB
Go
104 lines
2.0 KiB
Go
package harvester
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import (
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"errors"
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"sync"
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uuid "github.com/satori/go.uuid"
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"github.com/elastic/beats/libbeat/logp"
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)
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// Registry struct manages (start / stop) a list of harvesters
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type Registry struct {
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sync.RWMutex
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harvesters map[uuid.UUID]Harvester
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wg sync.WaitGroup
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done chan struct{}
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}
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// NewRegistry creates a new registry object
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func NewRegistry() *Registry {
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return &Registry{
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harvesters: map[uuid.UUID]Harvester{},
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done: make(chan struct{}),
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}
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}
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func (r *Registry) remove(h Harvester) {
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r.Lock()
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defer r.Unlock()
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delete(r.harvesters, h.ID())
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}
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func (r *Registry) add(h Harvester) {
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r.Lock()
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defer r.Unlock()
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r.harvesters[h.ID()] = h
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}
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// Stop stops all harvesters in the registry
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func (r *Registry) Stop() {
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r.Lock()
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defer func() {
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r.Unlock()
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r.WaitForCompletion()
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}()
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// Makes sure no new harvesters are added during stopping
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close(r.done)
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for _, hv := range r.harvesters {
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go func(h Harvester) {
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h.Stop()
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}(hv)
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}
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}
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// WaitForCompletion can be used to wait until all harvesters are stopped
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func (r *Registry) WaitForCompletion() {
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r.wg.Wait()
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}
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// Start starts the given harvester and add its to the registry
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func (r *Registry) Start(h Harvester) error {
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// Make sure stop is not called during starting a harvester
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r.Lock()
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defer r.Unlock()
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// Make sure no new harvesters are started after stop was called
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if !r.active() {
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return errors.New("registry already stopped")
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}
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r.wg.Add(1)
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go func() {
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defer func() {
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r.remove(h)
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r.wg.Done()
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}()
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r.add(h)
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// Starts harvester and picks the right type. In case type is not set, set it to default (log)
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err := h.Run()
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if err != nil {
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logp.Err("Error running prospector: %v", err)
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}
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}()
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return nil
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}
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// Len returns the current number of harvesters in the registry
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func (r *Registry) Len() uint64 {
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r.RLock()
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defer r.RUnlock()
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return uint64(len(r.harvesters))
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}
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func (r *Registry) active() bool {
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select {
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case <-r.done:
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return false
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default:
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return true
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}
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}
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